Dechun Zou for China-US Workshop 2009
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Transcript of Dechun Zou for China-US Workshop 2009
China-US Workshop‘2009/ChangzhouChina-US Workshop‘2009/Changzhou
Dechun ZouDechun Zou
Peking UniversityPeking University
Flexible and Weave-able Solar Flexible and Weave-able Solar
CellsCells
Dechun Zou, Peking University 2
Outline
BackgroundBackground
Some key subjects concerned with PV.Some key subjects concerned with PV.
Flexible and Weave-able Solar CellFlexible and Weave-able Solar Cell
A:Mesh typeA:Mesh type B: Fiber typeB: Fiber type
SummarySummary
Dechun Zou, Peking University 3
Why Photovoltaic Cell (PVC)
•Clean, Abundant,, Sustainable
•Widely-distributed , Easy transformation
Dechun Zou, Peking University 4
Some key subjects in PVC research
How to increase the efficiency?How to increase the efficiency?
Stable to light, heat, impactStable to light, heat, impact
Raw materials’ supply, Cost and Raw materials’ supply, Cost and
fabrication processfabrication process
Environment-friendlyEnvironment-friendly
Dechun Zou, Peking University 5
How to increase the efficiency
Increasing the light harvesting rate;Increasing the light harvesting rate;
Optimizing the cell structure and process ; Optimizing the cell structure and process ;
Exploring new device structure and Exploring new device structure and
material systems;material systems;
Dechun Zou, Peking University 6
How to Increase the light harvesting rate
1.1. Development of wide absorption materialsDevelopment of wide absorption materials
2.2. Design of low reflection surfaceDesign of low reflection surface
透过式
Grating typeFlat type
Dechun Zou, Peking University 7
The most desired structures for efficient light harvesting
1.1. Stereoscopic absorption structureStereoscopic absorption structure
2.2. Multilayered absorption structureMultilayered absorption structure
3.3. Combination of devices with extra high Combination of devices with extra high
absorption in different wave bandabsorption in different wave band
These structure are extremely effective for lowering These structure are extremely effective for lowering
the reflection and increasing light absorptionthe reflection and increasing light absorption
Dechun Zou, Peking University 8
How to solve aboue problems
1.1. How to change the rigid and plate How to change the rigid and plate
structure;structure;
2.2. How to realize a ITO-free structure.How to realize a ITO-free structure.
Dechun Zou, Peking University 9
Some key problems in PVC research
Dechun Zou, Peking University 10
Example of fiber shaped PVC
Optical fiber based Solar cellOptical fiber based Solar cell
ITO was coated on the outer surface of optical fiberITO was coated on the outer surface of optical fiber
Light reaches the cell unit from the end of the fiberLight reaches the cell unit from the end of the fiber
Jiwen Liu, David L. Carrolla * et alJiwen Liu, David L. Carrolla * et alAppl. Phys. Lett. 90, 063501 2007Appl. Phys. Lett. 90, 063501 2007
Dechun Zou, Peking University 11
Example of fiber shaped PVC
““Tube-by-tube” type Solar cellTube-by-tube” type Solar cell
As the counter electrode, the ITO was coated on the As the counter electrode, the ITO was coated on the
inner side of the plastic tubeinner side of the plastic tube
Baps B. et al ,EURO CERAMICS VII, PT 1-3 (Key Engineering Materials 2002, Baps B. et al ,EURO CERAMICS VII, PT 1-3 (Key Engineering Materials 2002, 206-213 )206-213 )
Chittibabu et al US 6,913,713 B2Chittibabu et al US 6,913,713 B2
SamplesSamples
Dechun Zou, Peking University 12
What we want to do
Novel flexible DSSCNovel flexible DSSC
Brand new cell’s structureBrand new cell’s structure
From plate to mesh, even to fiberFrom plate to mesh, even to fiber
Flexibility on higher degreeFlexibility on higher degree
No transparent conducting OxideNo transparent conducting Oxide
Weave-ableWeave-able
Traditional cell modulesTraditional cell modules
Dechun Zou, Peking University 13
How to do
Photon capturePhoton capture :: transmission—transmission— 〉〉 scatteringscattering
The combination of nano- functional structure andThe combination of nano- functional structure and
micro- cell unit’smicro- cell unit’s structure.structure.
traditional traditional transmission-transmission-
style style 散射式ScatterinScattering typeg type
Dechun Zou, Peking University 14
Approaches
1)1) From the weave type substrate, like meshFrom the weave type substrate, like mesh
2)2) From single fiber cell to the weave type From single fiber cell to the weave type
modulemodule
Dechun Zou, Peking University 15
Novel Flexible DSSC
Mesh-like DSSCMesh-like DSSC
Conductive MeshConductive Mesh/TiO/TiO22/Dye/Electrolyte/Dye/Electrolyte (( LiquidLiquid )) //Counter Counter
ElectrodeElectrode
No transparent conducting materials any moreNo transparent conducting materials any more
CheapCheap
Mechanical StabilityMechanical Stability
Simple to fabricateSimple to fabricate
Photo-electrodePhoto-electrode
Dechun Zou, Peking University 16
Novel Flexible DSSC
Mesh-like DSSCMesh-like DSSC
Conductive MeshConductive Mesh/TiO/TiO22/Dye/Electrolyte/Dye/Electrolyte (( LiquidLiquid)) //Counter ElectrodeCounter Electrode
No ITO or FTO No ITO or FTO
Voc: Voc: ~~700mV700mV
Isc: 4.5mA/cm2Isc: 4.5mA/cm2
Efficiency: 1.5%Efficiency: 1.5%
• X.Fan, Dechun Zou et al Appl.Phys.Lett. 90, 073501 2007• China Patent 200610114454.7
Dechun Zou, Peking University 17
Novel flexible DSSC
Mesh-like working electrodeMesh-like working electrode
Dechun Zou, Peking University 18
Novel Flexible DSSC
Fibrous Flexible DSSCFibrous Flexible DSSC
Conductive fiberConductive fiber/TiO/TiO22/Dye/Electrolyte/Dye/Electrolyte (( liquidliquid )) / / Conductive fiberConductive fiber
What’s inside the cell: Nano semiconductor particlesWhat’s inside the cell: Nano semiconductor particles
•Dechun Zou et al Adv. Mater. 2008, 20(3), 592-595.
•China Patent 200610089645.2
5~ 100μm in radius5~ 100μm in radius
Dechun Zou, Peking University 19
Novel Flexible DSSC
Fibrous Flexible DSSCFibrous Flexible DSSC
Conductive fiberConductive fiber/TiO/TiO22/Dye/Electrolyte/Dye/Electrolyte (( LiquidLiquid )) / / Conductive Conductive
fiberfiber
•Dechun Zou et al Adv. Mater. 2008, 20(3), 592-595.
•China Patent 200610089645.2
Dechun Zou, Peking University 20
Novel Flexible DSSC
All-solid Fibrous DSSCAll-solid Fibrous DSSC
Conductive fiberConductive fiber/TiO/TiO22/Dye/Electrolyte/Dye/Electrolyte (( SolidSolid )) / /
Conductive fiber (Store in air >6000h)Conductive fiber (Store in air >6000h)
•Dechun Zou*, et al, Appl. Phys. Lett., 92, 113510 (2008).
Dechun Zou, Peking University 21
Novel Flexible DSSC
Fibrous flexible DSSCFibrous flexible DSSC
Conductive fiberConductive fiber/TiO/TiO22/Dye/Electrolyte/Dye/Electrolyte/ / Conductive fiberConductive fiber
Low light incident-angle dependencyLow light incident-angle dependency
Dechun Zou, Peking University 22
Highly efficient light harvesting structure
Wide absorption Wide absorption structurestructure
Oven stereoscopic and Oven stereoscopic and multilayered light harvesting multilayered light harvesting
structurestructure
Low reflection and Low reflection and photon trapping photon trapping
structurestructure
hv
Dechun Zou, Peking University 23
Fibrous DSSC
Cotton Wire
Hair
The fibrous DSSC (in blue circle)
Dechun Zou, Peking University 24
Touch panel: to conduct the electrons out
The wire inside the circle is the fibrous cell
INSTRUCTION
Demos
-0.10 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 0.30
-0.00002
0.00000
0.00002
0.00004
0.00006
0.00008
0.00010
J(A
/cm
)
E(V)
light dark
Voc=256mV Jsc=0.092mA/cm
η ( % ) =0.57%(without mirror)
Dechun Zou, Peking University 25
What we did —— a summary
Well supplied
Dimension Dimension DownDown
FlexibleFlexible
Fiber Fiber shapedshaped
ITO ITO freefree
Weave-Weave-ableable
Dechun Zou, Peking University 26
Acknowledgement
Thank NSFC and MOE
for the fund support !
Dechun Zou, Peking University 27
Thank you for your
attention !